Basic security item for perimeter monitoring. Used by US troops around the world. Comes with light stick, trip wire device. When activated by wire movement, the light stick is activated and you are warned about a perimeter breach. Can be attached or mounted by a variety of methods. Sturdy, rugged and can be used hundreds of times . We sell extra trip wire (MGR-731) and replacement Cyalume light sticks (ZAA-15)